package week10;

import java.util.Scanner;

public class Main71 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] a = new int[5];
		String str = null;
		
		while(true){
			String choice = sc.next();
			try{
				if(choice.equals("arr")){
			        int index = sc.nextInt();
			        a[index]= 1;      
			}else if(choice.equals("null")){
				str.length();
			}else if(choice.equals("cast")){
				Object o = new String("str");
				Integer x = (Integer.parseInt(str));
			}else if(choice.equals("num")){
				String intNum = sc.next();
				Integer.parseInt(intNum);
			}else{
				break;
			}
		}catch(Exception e){
			System.out.println(e);
		}

	}
    sc.close();
}
}